Lens driving module having hall sensor and magnet in alignment along a direction parallel to optical axis

ABSTRACT

A lens driving module includes a holder, a cover, a carrier, at least one first magnet, a first coil, at least two second magnets, at least one first sensor and at least one second sensor. The holder includes an opening hole. The cover is made of metal material and coupled to the holder. The carrier is movably disposed in the cover and for coupling to a lens. The first magnet is movably disposed in the cover. The first coil is wound around an outer side of the carrier. The second magnets are disposed on one end of the carrier. The first sensor is for detecting a magnetic field of the second magnets. The second sensor is for detecting a magnetic field of the first magnet.

RELATED APPLICATIONS

The present application is a continuation of the application Ser. No.14/525,390, filed Oct. 28, 2014, now U.S. Pat. No. 10,197,812, whichclaims priority to Taiwan Application Serial Number 103216584, filedSep. 18, 2014, which is herein incorporated by reference.

BACKGROUND Technical Field

The present disclosure relates to a lens driving module. Moreparticularly, the present disclosure relates to a lens driving moduleapplicable to mobile terminals.

Description of Related Art

In general, the voice-coil motor (VCM) cooperated to an open-loopcontrolling method is applied to the lens for providing anauto-focusing. However, the conventional VCM cannot provide feedbacksignal to the actuator during moving the lens, so that the presentposition of the lens cannot be notified immediately. Hence, the lensshould be moved to the original position before focusing every time,that is, the focusing time would be lengthened and the operation wouldnot be fluency.

Furthermore, it is inevasible for camera shake during operation.However, the lens can be merely moved in the direction parallel to thelens and cannot be moved in the direction orthogonal to the lens via theconventional VCM. Hence, it cannot compensate for the shaking driftamount from the camera shake to get stable image so as to degrade theshooting result and affect the shooting experience.

SUMMARY

According to one aspect of the present disclosure, a lens driving moduleincludes a holder, a cover, a carrier, at least one first magnet, afirst coil, at least two second magnets, at least one first sensor andat least one second sensor. The holder includes an opening hole. Thecover is made of metal material and coupled to the holder. The carrieris movably disposed in the cover and for coupling to a lens, wherein amoving direction of the carrier includes a first direction which isparallel to an optical axis of the lens. The first magnet is movablydisposed in the cover, wherein a moving direction of the first magnetincludes a second direction which is orthogonal to the optical axis ofthe lens. The first coil is wound around an outer side of the carrierand adjacent to the first magnet. The second magnets are disposed on oneend of the carrier which is toward the holder. The first sensor is aHall sensor, and for detecting a magnetic field of any one of the secondmagnets, wherein the magnetic field is varied according to a relativedisplacement between the first sensor and the second magnet which isdetected. The second sensor is for detecting a magnetic field of thefirst magnet, wherein the magnetic field is varied according to arelative displacement between the second sensor and the first magnetwhich is detected.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1 shows an external schematic view of a lens driving moduleaccording to the 1st embodiment of the present disclosure;

FIG. 2 shows a top view of the lens driving module according to the 1stembodiment;

FIG. 3 shows an exploded view of the lens driving module according tothe 1st embodiment;

FIG. 4 shows a sectional view of the lens driving module along thesectional line 4-4 of FIG. 2;

FIG. 5 shows a sectional view of the lens driving module along thesectional line 5-5 of FIG. 2;

FIG. 6A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 1st embodiment;

FIG. 6B is a schematic view showing the parameters d and W of the lensdriving module according to the 1st embodiment;

FIG. 6C is a schematic view showing the parameters A and B of the lensdriving module according to the 1st embodiment;

FIG. 7A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 2nd embodiment;

FIG. 7B is a schematic view showing the parameters d and W of the lensdriving module according to the 2nd embodiment;

FIG. 7C is a schematic view showing the parameters A and B of the lensdriving module according to the 2nd embodiment;

FIG. 8A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 3rd embodiment;

FIG. 8B is a schematic view showing the parameters d and W of the lensdriving module according to the 3rd embodiment;

FIG. 8C is a schematic view showing the parameters A and B of the lensdriving module according to the 3rd embodiment;

FIG. 9A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 4th embodiment;

FIG. 9B is a schematic view showing the parameters d and W of the lensdriving module according to the 4th embodiment;

FIG. 9C is a schematic view showing the parameters A and B of the lensdriving module according to the 4th embodiment;

FIG. 9D shows a schematic view of the lens of a lens driving moduleaccording to the 4th embodiment;

FIG. 9E shows a schematic view of the carrier and the second magnets ofthe lens driving module according to the 4th embodiment;

FIG. 10A is a schematic view showing the parameters Φc and Φm of thelens driving module according to the 5th embodiment;

FIG. 10B is a schematic view showing the parameters d and W of the lensdriving module according to the 5th embodiment; and

FIG. 10C is a schematic view showing the parameters A and B of the lensdriving module according to the 5th embodiment.

DETAILED DESCRIPTION

FIG. 1 shows an external schematic view of a lens driving moduleaccording to the 1st embodiment of the present disclosure. FIG. 2 showsa top view of the lens driving module according to the 1st embodiment.FIG. 3 shows an exploded view of the lens driving module according tothe 1st embodiment. The lens driving module includes a holder 100, acover 200, a carrier 300, at least one first magnet 510, a first coil610, at least two second magnets 520, at least one first sensor 710 andat least one second sensor 720. In FIG. 1, the components of the lensdriving module can be covered by the cover 200, and the cover 200 iscoupled to the holder 100, so that the lens driving module can beapplied to the electronic product, and the components can be separatedfrom the external environment.

In detail, the holder 100 includes an opening hole 110, the cover 200 ismade of metal material and coupled to the holder 100. In FIG. 3, thecover 200 is cube-shaped and includes four side walls 201 formed intoclosed-shape. One end of the cover 200 is an end wall 202 which includesan opening 203, wherein the end wall 202 is connected to the side walls201. The other end of the cover 200 is an open end and for coupling tothe holder 100. Therefore, a lens 400 can be movably disposed throughthe opening 203 of the end wall 202 of the cover 200 which iscorresponding to the opening hole 110 of the holder 100.

The carrier 300 is movably disposed in the cover 200, and for couplingto the lens 400, wherein a moving direction of the carrier 300 includesa first direction Z which is parallel to an optical axis of the lens400. That is, the carrier 300 and the lens 400 can be moved between theopening 203 of the end wall 202 of the cover 200 and the opening hole110 of the holder 100 along the first direction Z. The lens 400 appliedto the lens driving module of the present disclosure can include atleast five lens elements with refractive power so as to provide higherresolution.

The first magnets 510 are movably disposed in the cover 200, wherein amoving direction of the first magnets 510 includes a second direction Xwhich is orthogonal to the optical axis of the lens 400. The first coil610 is wound around an outer side of the carrier 300 and adjacent to thefirst magnets 510. In FIG. 3, a number of the first magnets 510 of thelens driving module in the 1st embodiment is four, wherein each of thefirst magnets 510 is movably disposed in the cover 200 which iscorresponding to each of four corners of the cover 200 respectively.Therefore, the first magnets 510 are equidistantly adjacent to the firstcoil 610.

FIG. 4 shows a sectional view of the lens driving module along thesectional line 4-4 of FIG. 2. In FIG. 4, the lens driving module canfurther include a spacer 310 connected to the first magnets 510, whereinthe carrier 300 is disposed in the spacer 310. Due to the first magnets510 is connected to and moved via the spacer 310, the first magnets 510can be moved stably and the compact size of the lens driving module canbe maintained.

At least two second magnets 520 are disposed on one end of the carrier300 which is toward the holder 100. A number of the second magnets 520can be two to six, and any two second magnets 520 which are adjacent toeach other can be equidistantly disposed on the end of the carrier 300in a circumferential direction. In the 1st embodiment, the lens drivingmodule includes two second magnets 520. FIG. 5 shows a sectional view ofthe lens driving module along the sectional line 5-5 of FIG. 2. In FIG.5, the second magnets 520 are symmetrically disposed on the end of thecarrier 300 which is toward the holder 100. Therefore, it is favorablefor reducing the complexity of mechanism and increasing the assemblingyield rate.

The first sensor 710 which is a Hall sensor. During a focusing procedureof the lens 400, the first sensor 710 is for detecting a magnetic fieldof any one of the second magnets 520. When the magnetic field is variedaccording to a relative displacement in the first direction Z betweenthe first sensor 710 and the second magnet 520 which is moved with thecarrier 300 is detected by the first sensor 710, the first sensor 710provides a feedback voltage signal to an electronic driver (not shown)corresponding to a position of the lens 400. Therefore, an outputcurrent can be provided by the electronic driver for moving the lens 400to a predetermined position without moving back to the originalposition.

During the focusing procedure of the lens 400, the second sensor 720 isfor detecting a magnetic field of any one of the first magnets 510. Whenthe magnetic field is varied according to a relative displacement in thesecond direction X between the second sensor 720 and the first magnet510 is detected by the second sensor 720, the second sensor 720 providesanother feedback voltage signal to another electronic drivercorresponding to a shaking drift amount of lens 400. Therefore, anotheroutput current is provided by the electronic driver to compensate theshaking drift amount of the lens 400 so as to reduce the problemsrelated to camera shake during operating mobile terminals. In the 1stembodiment, a number of the second sensor 720 is two, and the secondsensors 720 can be Hall sensors so as to increase resolutions of shakedetecting.

In the 1st embodiment, the lens driving module can further include animaging element 810 and a circuit board 800, wherein the imaging element810 is for receiving an imaging light of the lens 400, and the imagingelement 810 and the first sensor 710 are disposed on the circuit board800. Therefore, it is favorable for increasing the manufacturingefficiency of the lens driving module.

In FIG. 3, the first sensor 710 and the second sensors 720 can bedisposed on the circuit board 800 and near the opening hole 110 of theholder 100, wherein the second sensors 720 is adjacent to one side ofthe first magnet 510 which is toward the holder 100. Therefore, it isfavorable for increasing the manufacturing efficiency.

Furthermore, the lens driving module can further include at least onefirst spring 320 and at least one second spring 330. The first spring320 is coupled to the end of the carrier 300 which is toward the holder100, the second spring 330 is coupled to the other end of the carrier300, wherein the first spring 320 and the second spring 330 are bothcoupled to the spacer 310. In FIG. 3, a number of the first spring 320is one and a number of the second spring 330 is two. When the lens 400is moved with the carrier 300, a degree of freedom in the firstdirection Z of the movement of the lens 400 can be provided by the firstspring 320 and the second springs 330. The first spring 320 and thesecond springs 330 are deformed as the carrier 300 moved and provide arestoring force to the carrier 300 during the carrier 300 moved to anoriginal position.

For further providing the compensation of the shaking drift amount fromcamera shake, the moving direction of the carrier 300 further includesthe second direction X and a third direction Y, wherein the firstdirection Z, the second direction X and the third direction Y areorthogonal to each other. Moreover, the lens driving module can furtherinclude at least three suspension wires 340, wherein one end of each ofthe suspension wires 340 is connected to a suspension plane 331 which isorthogonal to the optical axis of the lens 400, and the suspension wires340 are arranged in the same direction which is parallel to the opticalaxis of the lens 400. In FIG. 3 and FIG. 4, a number of the suspensionwires 340 in the lens driving module is four, wherein the suspensionwires 340 are made of metal material and have elasticity. The end ofeach suspension wires 340 is connected to the suspension plane 331 whichis one side toward to the holder 100 of the second spring 330, andanother end of each suspension wires 340 is connected to the holder 100.Therefore, the suspension wires 340 not only provide the degrees offreedom of the movement of the carrier 300 orthogonal to the opticalaxis of the lens 400, but also restrict the shifting range of thesuspension wires 340, wherein the suspension wires 340 can further beserved as conductive wires.

Moreover, the moving direction of each of the first magnets 510 furtherincludes the third direction Y. Therefore, it is favorable formaintaining the accuracy of the lens driving module. Each of the firstmagnets 510 includes at least one first parallel surface 511 and atleast one first orthogonal surface 512, wherein the first parallelsurface 511 is parallel to the optical axis of the lens 400, and thefirst orthogonal surface 512 is orthogonal to the optical axis of thelens 400. In FIG. 3, each of the first magnets 510 is a hexagonalcylinder, wherein each of the first magnets 510 includes two orthogonalsurfaces 512 and six first parallel surfaces 511.

Furthermore, the lens driving module can further include at least onesecond coil 620 which is adjacent to the first magnets 510. Hence, thecarrier 300 and the first magnets 510 can be moved in the seconddirection X. The number of the first magnets 510 and a number of thesecond coil 620 can be equal, and the number of the first magnets 510and the number of the second coil 620 can be both at least four.Therefore, the carrier 300 and the first magnets 510 are driven by thesecond coil 620 averagely and stably, and the compact size of the lensdriving module can be maintained. In FIG. 3, the number of the firstmagnets 510 and the number of the second coil 620 are both four. Each ofthe second coils 620 can be a band coil being closed loop and includesan enclosed space inside, wherein the second sensors 720 can be disposedon the circuit board 800 and corresponding to the enclosed spaces insidethe second coils 620.

In detail, the second coils 620 can be disposed on the holder 100 andnear the opening hole 110. Each of the second coils 620 is adjacent tothe side of each of the first magnets 510 which is toward the holder100, that is, each of the second coils 620 is adjacent to the firstorthogonal surfaces 512 of each of the first magnets 510.

FIG. 6A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 1st embodiment. FIG. 6B is a schematicview showing the parameters d and W of the lens driving module accordingto the 1st embodiment. In FIG. 6A and FIG. 6B, when a diameter of asmallest inscribed circle with a center of the first coil 610 is Φc, adiameter which is a greatest straight-line distance between the centersof any two of the second magnets 520 is Φm, and a width parallel to theoptical axis of the lens 400 of the first coil 610 is W, the followingcondition is satisfied: |Φc−Φm|/2<W. Therefore, it is favorable formaintaining the compact size of the lens driving module and reducing thecomplexity of mechanism.

In FIG. 6B, each of the second coils 620 includes a ring plane 621 whichis orthogonal to the optical axis of the lens 400 and toward the firstmagnet 510. When a smallest air gap which is parallel to the opticalaxis of the lens 400 between the ring plane 621 of one of the secondcoils 620 and the first orthogonal surface 512 of one of the firstmagnet 510 which is toward the second coil 620 is d, the followingcondition is satisfied: d<0.7 mm. Therefore, the efficiency of thecarrier 300 driven by the second coil 620 is increased so as to achievethe advantages of power saving and compact size. FIG. 6C is a schematicview showing the parameters A and B of the lens driving module accordingto the 1st embodiment. Each of the second coils 620 includes a ringplane 621 which is orthogonal to the optical axis of the lens 400 andtoward each of the first magnets 510. When an area of the ring plane 621is A, the following condition is satisfied: 2.3 mm²<A<8.5 mm².Therefore, it is favorable for balancing the sensitivity and the powerconsumption during the carrier 300 driven by the second coils 620.

In FIG. 6C, each of the second coils 620 includes the ring plane 621 andan enclosed plane 622. The ring plane 621 is orthogonal to the opticalaxis of the lens 400 and toward each of the first magnets 510. Theenclosed plane 622 is enclosed by the ring plane 621. When an area ofthe enclosed plane 622 is B, the following condition is satisfied: 0.5mm²<B<2.9 mm². Therefore, it is favorable for maintaining thesensitivity of the second coils 620.

In FIG. 4, each of the second sensors 720 includes a second sensorsurface 721 which is orthogonal to the optical axis of the lens 400.When an area of the second sensor surface 721 is C, the followingcondition is satisfied: 0.35 mm²<C<1.5 mm². Therefore, it is favorablefor maintaining the compact size of the lens driving module. Preferably,the following condition is satisfied: 0.35 mm²<C<1.0 mm².

In the 1st embodiment of the present disclosure, the diameter of thesmallest inscribed circle of the first coil 610 (Φc), the diameter whichis the greatest straight-line distance between the centers of any two ofthe second magnets 520 (Φm), the data of |Φc−Φm|/2, the width parallelto the optical axis of the lens 400 of the first coil 610 (W), thesmallest air gap which is parallel to the optical axis of the lens 400between the ring plane 621 of the second coil 620 and the firstorthogonal surface 512 of the first magnet 510 (d), the area of the ringplane 621 (A), the area of the enclosed plane 622 (B), and the area ofthe second sensor surface 721 (C) are listed in the following Table 1.

TABLE 1 1st Embodiment Φc (mm) 7.16 d (mm) 0.10 Φm (mm) 7.30 A (mm) 5.70|Φc − Φm|/2 (mm) 0.07 B (mm) 1.14 W (mm) 0.60 C (mm) 1.28

FIG. 7A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 2nd embodiment. FIG. 7B is a schematicview showing the parameters d and W of the lens driving module accordingto the 2nd embodiment. FIG. 7C is a schematic view showing theparameters A and B of the lens driving module according to the 2ndembodiment. The elements arrangement in the 2nd embodiment is the sameas the 1st embodiment, and will not be described again herein.

In the 2nd embodiment of the present disclosure, the diameter of thesmallest inscribed circle of the first coil 610 (Φc), the diameter whichis the greatest straight-line distance between the centers of any two ofthe second magnets 520 (Φm), the data of |Φc−Φm|/2, the width parallelto the optical axis of the lens 400 of the first coil 610 (W), thesmallest air gap which is parallel to the optical axis of the lens 400between the ring plane 621 of the second coil 620 and the firstorthogonal surface 512 of the first magnet 510 (d), the area of the ringplane 621 (A), the area of the enclosed plane 622 (B), and the area ofthe second sensor surface 721 (C) are listed in the following Table 2.

TABLE 2 2nd Embodiment Φc (mm) 7.13 d (mm) 0.40 Φm (mm) 7.12 A (mm) 7.83|Φc − Φm|/2 (mm) 0.00 B (mm) 1.48 W (mm) 0.70 C (mm) 0.60

FIG. 8A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 3rd embodiment. FIG. 8B is a schematicview showing the parameters d and W of the lens driving module accordingto the 3rd embodiment. FIG. 8C is a schematic view showing theparameters A and B of the lens driving module according to the 3rdembodiment. The elements arrangement in the 3rd embodiment is the sameas the 1st embodiment, and will not be described again herein.

In the 3rd embodiment of the present disclosure, the diameter of thesmallest inscribed circle of the first coil 610 (Φc), the diameter whichis the greatest straight-line distance between the centers of any two ofthe second magnets 520 (Φm), the data of |Φc−Φm|/2, the width parallelto the optical axis of the lens 400 of the first coil 610 (W), thesmallest air gap which is parallel to the optical axis of the lens 400between the ring plane 621 of the second coil 620 and the firstorthogonal surface 512 of the first magnet 510 (d), the area of the ringplane 621 (A), the area of the enclosed plane 622 (B), and the area ofthe second sensor surface 721 (C) are listed in the following Table 3.

TABLE 3 3rd Embodiment Φc (mm) 7.13 d (mm) 0.60 Φm (mm) 6.74 A (mm) 7.01|Φc − Φm|/2 (mm) 0.20 B (mm) 1.52 W (mm) 1.00 C (mm) 0.72

FIG. 9A is a schematic view showing the parameters Φc and Φm of the lensdriving module according to the 4th embodiment. FIG. 9B is a schematicview showing the parameters d and W of the lens driving module accordingto the 4th embodiment. FIG. 9C is a schematic view showing theparameters A and B of the lens driving module according to the 4thembodiment. FIG. 9D shows a schematic view of the lens 400 of a lensdriving module according to the 4th embodiment. FIG. 9E shows aschematic view of the carrier 300 and the second magnets 520 of the lensdriving module according to the 4th embodiment. In FIG. 9D and FIG. 9E,the lens 400 includes six lens elements which are made of plasticmaterial and with refractive power. Therefore, it is favorable forincreasing the resolutions of the lens driving module. Furthermore, thenumber of the second magnets 520 is four, and any two second magnets 520which are adjacent to each other can be equidistantly disposed on theend toward the holder 100 of the carrier 300 in a circumferentialdirection, wherein the number of the second magnets 520 should not belimited to the embodiment. Therefore, it is favorable for reducing theskew of the lens 400 so as to enhance the image quality.

In the 4th embodiment of the present disclosure, the diameter of thesmallest inscribed circle of the first coil 610 (Φc), the diameter whichis the greatest straight-line distance between the centers of any two ofthe second magnets 520 (Φm), the data of |Φc−Φm|/2, the width parallelto the optical axis of the lens 400 of the first coil 610 (W), thesmallest air gap which is parallel to the optical axis of the lens 400between the ring plane 621 of the second coil 620 and the firstorthogonal surface 512 of the first magnet 510 (d), the area of the ringplane 621 (A), the area of the enclosed plane 622 (B), and the area ofthe second sensor surface 721 (C) are listed in the following Table 4.

TABLE 4 4th Embodiment Φc (mm) 7.14 d (mm) 0.30 Φm (mm) 6.60 A (mm) 2.85|Φc − Φm|/2 (mm) 0.27 B (mm) 0.70 W (mm) 0.90 C (mm) 0.69

FIG. 10A is a schematic view showing the parameters Φc and Φm of thelens driving module according to the 5th embodiment. FIG. 10B is aschematic view showing the parameters d and W of the lens driving moduleaccording to the 5th embodiment. FIG. 10C is a schematic view showingthe parameters A and B of the lens driving module according to the 3rdembodiment. The elements arrangement in the 5th embodiment is the sameas the 1st embodiment, and will not be described again herein.

In the 5th embodiment of the present disclosure, the diameter of thesmallest inscribed circle of the first coil 610 (Φc), the diameter whichis the greatest straight-line distance between the centers of any two ofthe second magnets 520 (Φm), the data of |Φc−Φm|/2, the width parallelto the optical axis of the lens 400 of the first coil 610 (W), thesmallest air gap which is parallel to the optical axis of the lens 400between the ring plane 621 of the second coil 620 and the firstorthogonal surface 512 of the first magnet 510 (d), the area of the ringplane 621 (A), the area of the enclosed plane 622 (B), and the area ofthe second sensor surface 721 (C) are listed in the following Table 5.

TABLE 5 5th Embodiment Φc (mm) 7.14 d (mm) 0.20 Φm (mm) 7.33 A (mm) 3.33|Φc − Φm|/2 (mm) 0.10 B (mm) 0.73 W (mm) 0.80 C (mm) 1.05

Therefore, when the variation of the magnetic field of the secondmagnets 520 is detected by the first sensor 710 in the presentdisclosure, the lens 400 is led to the predetermined position forfocusing by the feedback current, so that it is favorable for saving thefocusing time. When the variation of the magnetic field of the firstmagnets 510 is detected by the second sensor 720, the shaking driftamount of the lens 400 is compensated by another feedback current to getthe stable image, so that it is favorable for reducing the problemsresulted from the camera shake.

Although the present disclosure has been described in considerabledetail with reference to certain embodiments thereof, other embodimentsare possible. Therefore, the spirit and scope of the appended claimsshould not be limited to the description of the embodiments containedherein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the presentdisclosure. In view of the foregoing, it is intended that the presentdisclosure cover modifications and variations of this disclosureprovided they fall within the scope of the following claims.

What is claimed is:
 1. A lens driving module, comprising: a holder,comprising an opening hole; a cover coupled to the holder; a carriermovably disposed in the cover, and for coupling to a lens, wherein amoving direction of the carrier comprises a first direction which isparallel to an optical axis of the lens; at least one first magnetmovably disposed in the cover, wherein a moving direction of the firstmagnet comprises a second direction which is orthogonal to the opticalaxis of the lens; a first coil wound around an outer side of thecarrier, and adjacent to the first magnet; at least one second magnetdisposed on one end of the carrier which is toward the holder, whereinthe second magnet is displaceable along the first direction; at leastone first sensor which is a Hall sensor, and for determining a relativedisplacement that has occurred in the first direction between the firstsensor and the second magnet via a magnetic field, wherein the magneticfield is varied according to the relative displacement, and the firstsensor and the second magnet are in alignment along the first direction;at least one second sensor for detecting a magnetic field of the firstmagnet, wherein the magnetic field of the first magnet is variedaccording to a relative displacement between the second sensor and thefirst magnet which is detected; an imaging element for receiving animaging light of the lens; and a circuit board, wherein the circuitboard and the carrier are arranged along the first direction, and theimaging element is disposed on the circuit board.
 2. The lens drivingmodule of claim 1, further comprising: at least three suspension wires,wherein one end of each of the suspension wires is connected to asuspension plane which is orthogonal to the optical axis of the lens,and the suspension wires are arranged in the same direction which isparallel to the optical axis of the lens.
 3. The lens driving module ofclaim 2, further comprising: a spacer connected to the first magnet,wherein the carrier is disposed in the spacer.
 4. The lens drivingmodule of claim 3, further comprising: at least one first spring coupledto the end of the carrier which is toward the holder; and at least onesecond spring coupled to the other end of the carrier.
 5. The lensdriving module of claim 4, wherein the second spring is coupled to thespacer and connected to the end of at least one of the suspension wires.6. The lens driving module of claim 1, wherein the first magnetcomprises: at least one first parallel surface which is parallel to theoptical axis of the lens; and at least one first orthogonal surfacewhich is orthogonal to the optical axis of the lens.
 7. The lens drivingmodule of claim 6, further comprising: at least one second coil which isadjacent to the first magnet while facing the first orthogonal surface.8. The lens driving module of claim 7, wherein the second coil isdisposed on the holder and near the opening hole, and the second coil isadjacent to one side of the first magnet which is toward the holder. 9.The lens driving module of claim 7, wherein the second coil is a bandcoil being closed loop and comprises a ring plane which is orthogonal tothe optical axis of the lens and toward the first magnet.
 10. The lensdriving module of claim 7, wherein the second coil comprises a ringplane which is orthogonal to the optical axis of the lens and toward thefirst magnet, a smallest air gap which is parallel to the optical axisof the lens between the ring plane and the first orthogonal surface ofthe first magnet is d, and the following condition is satisfied:d<0.7 mm.
 11. The lens driving module of claim 7, wherein the secondsensor is disposed near the opening hole of the holder, and the secondsensor is adjacent to one side of the first magnet which is toward theholder.
 12. The lens driving module of claim 11, wherein the firstsensor is disposed near the opening hole of the holder.
 13. The lensdriving module of claim 8, wherein the second coil is a band coil beingclosed loop, and the second sensor is corresponding to an enclosed spaceinside the second coil.
 14. The lens driving module of claim 9, whereinthe second coil comprises a ring plane which is orthogonal to theoptical axis of the lens and toward the first magnet, an area of thering plane is A, and the following condition is satisfied:2.3 mm² <A<8.5 mm².
 15. The lens driving module of claim 9, wherein thesecond coil comprises: a ring plane which is orthogonal to the opticalaxis of the lens and toward the first magnet; and an enclosed planewhich is enclosed by the ring plane, an area of the enclosed plane is B,and the following condition is satisfied:0.5 mm² <B<2.9 mm².
 16. The lens driving module of claim 9, wherein thesecond sensor comprises a second sensor surface which is orthogonal tothe optical axis of the lens, an area of the second sensor surface is C,and the following condition is satisfied:0.35 mm² <C<1.5 mm².
 17. The lens driving module of claim 1, wherein thesecond sensor is disposed on the circuit board.
 18. The lens drivingmodule of claim 1, wherein the lens comprises at least five lenselements with refractive power.
 19. The lens driving module of claim 1,wherein the second sensor comprises a second sensor surface which isorthogonal to the optical axis of the lens, an area of the second sensorsurface is C, and the following condition is satisfied:0.35 mm² <C<1.0 mm².
 20. The lens driving module of claim 1, wherein anumber of the second magnet is two to six, and any two second magnetswhich are adjacent to each other are equidistantly disposed on the endof the carrier in a circumferential direction.
 21. The lens drivingmodule of claim 20, wherein a number of the second magnets is two andsymmetrically disposed on the end of the carrier.
 22. The lens drivingmodule of claim 20, wherein a diameter of a smallest inscribed circlewith a center of the first coil is Φc, a diameter which is a greateststraight-line distance between the centers of any two of the secondmagnets is Φm, a width parallel to the optical axis of the lens of thefirst coil is W, and the following condition is satisfied:|Φc−Φm|/2<W.
 23. The lens driving module of claim 2, wherein the movingdirection of the carrier further comprises the second direction and athird direction, the first direction, the second direction and the thirddirection are orthogonal to each other, the second sensor is a Hallsensor, and a number of the second sensor is at least two.
 24. The lensdriving module of claim 23, wherein the moving direction of the firstmagnet further comprises the third direction.
 25. The lens drivingmodule of claim 24, further comprising: at least one second coil;wherein a number of the first magnet and a number of the second coil areequal, and each of the numbers of the first magnet and the second coilis at least four.